mio/sys/unix/
net.rs

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1use std::io;
2use std::mem::size_of;
3use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
4
5pub(crate) fn new_ip_socket(addr: SocketAddr, socket_type: libc::c_int) -> io::Result<libc::c_int> {
6    let domain = match addr {
7        SocketAddr::V4(..) => libc::AF_INET,
8        SocketAddr::V6(..) => libc::AF_INET6,
9    };
10
11    new_socket(domain, socket_type)
12}
13
14/// Create a new non-blocking socket.
15pub(crate) fn new_socket(domain: libc::c_int, socket_type: libc::c_int) -> io::Result<libc::c_int> {
16    #[cfg(any(
17        target_os = "android",
18        target_os = "dragonfly",
19        target_os = "freebsd",
20        target_os = "hurd",
21        target_os = "illumos",
22        target_os = "linux",
23        target_os = "netbsd",
24        target_os = "openbsd",
25        target_os = "solaris",
26        target_os = "hermit",
27    ))]
28    let socket_type = socket_type | libc::SOCK_NONBLOCK | libc::SOCK_CLOEXEC;
29    #[cfg(target_os = "nto")]
30    let socket_type = socket_type | libc::SOCK_CLOEXEC;
31
32    let socket = syscall!(socket(domain, socket_type, 0))?;
33
34    // Mimic `libstd` and set `SO_NOSIGPIPE` on apple systems.
35    #[cfg(any(
36        target_os = "ios",
37        target_os = "macos",
38        target_os = "tvos",
39        target_os = "visionos",
40        target_os = "watchos",
41    ))]
42    if let Err(err) = syscall!(setsockopt(
43        socket,
44        libc::SOL_SOCKET,
45        libc::SO_NOSIGPIPE,
46        &1 as *const libc::c_int as *const libc::c_void,
47        size_of::<libc::c_int>() as libc::socklen_t
48    )) {
49        let _ = syscall!(close(socket));
50        return Err(err);
51    }
52
53    // Darwin (and others) doesn't have SOCK_NONBLOCK or SOCK_CLOEXEC.
54    #[cfg(any(
55        target_os = "aix",
56        target_os = "ios",
57        target_os = "macos",
58        target_os = "tvos",
59        target_os = "visionos",
60        target_os = "watchos",
61        target_os = "espidf",
62        target_os = "vita",
63        target_os = "nto",
64    ))]
65    {
66        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFL, libc::O_NONBLOCK)) {
67            let _ = syscall!(close(socket));
68            return Err(err);
69        }
70        #[cfg(not(any(target_os = "espidf", target_os = "vita", target_os = "nto")))]
71        if let Err(err) = syscall!(fcntl(socket, libc::F_SETFD, libc::FD_CLOEXEC)) {
72            let _ = syscall!(close(socket));
73            return Err(err);
74        }
75    }
76
77    Ok(socket)
78}
79
80/// A type with the same memory layout as `libc::sockaddr`. Used in converting Rust level
81/// SocketAddr* types into their system representation. The benefit of this specific
82/// type over using `libc::sockaddr_storage` is that this type is exactly as large as it
83/// needs to be and not a lot larger. And it can be initialized cleaner from Rust.
84#[repr(C)]
85pub(crate) union SocketAddrCRepr {
86    v4: libc::sockaddr_in,
87    v6: libc::sockaddr_in6,
88}
89
90impl SocketAddrCRepr {
91    pub(crate) fn as_ptr(&self) -> *const libc::sockaddr {
92        self as *const _ as *const libc::sockaddr
93    }
94}
95
96/// Converts a Rust `SocketAddr` into the system representation.
97pub(crate) fn socket_addr(addr: &SocketAddr) -> (SocketAddrCRepr, libc::socklen_t) {
98    match addr {
99        SocketAddr::V4(ref addr) => {
100            // `s_addr` is stored as BE on all machine and the array is in BE order.
101            // So the native endian conversion method is used so that it's never swapped.
102            let sin_addr = libc::in_addr {
103                s_addr: u32::from_ne_bytes(addr.ip().octets()),
104            };
105
106            let sockaddr_in = libc::sockaddr_in {
107                sin_family: libc::AF_INET as libc::sa_family_t,
108                sin_port: addr.port().to_be(),
109                sin_addr,
110                #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
111                sin_zero: [0; 8],
112                #[cfg(target_os = "haiku")]
113                sin_zero: [0; 24],
114                #[cfg(target_os = "vita")]
115                sin_zero: [0; 6],
116                #[cfg(any(
117                    target_os = "aix",
118                    target_os = "dragonfly",
119                    target_os = "freebsd",
120                    target_os = "haiku",
121                    target_os = "hurd",
122                    target_os = "ios",
123                    target_os = "macos",
124                    target_os = "netbsd",
125                    target_os = "openbsd",
126                    target_os = "tvos",
127                    target_os = "visionos",
128                    target_os = "watchos",
129                    target_os = "espidf",
130                    target_os = "vita",
131                    target_os = "hermit",
132                    target_os = "nto",
133                ))]
134                sin_len: 0,
135                #[cfg(target_os = "vita")]
136                sin_vport: addr.port().to_be(),
137            };
138
139            let sockaddr = SocketAddrCRepr { v4: sockaddr_in };
140            let socklen = size_of::<libc::sockaddr_in>() as libc::socklen_t;
141            (sockaddr, socklen)
142        }
143        SocketAddr::V6(ref addr) => {
144            let sockaddr_in6 = libc::sockaddr_in6 {
145                sin6_family: libc::AF_INET6 as libc::sa_family_t,
146                sin6_port: addr.port().to_be(),
147                sin6_addr: libc::in6_addr {
148                    s6_addr: addr.ip().octets(),
149                },
150                sin6_flowinfo: addr.flowinfo(),
151                sin6_scope_id: addr.scope_id(),
152                #[cfg(any(
153                    target_os = "aix",
154                    target_os = "dragonfly",
155                    target_os = "freebsd",
156                    target_os = "haiku",
157                    target_os = "hurd",
158                    target_os = "ios",
159                    target_os = "macos",
160                    target_os = "netbsd",
161                    target_os = "openbsd",
162                    target_os = "tvos",
163                    target_os = "visionos",
164                    target_os = "watchos",
165                    target_os = "espidf",
166                    target_os = "vita",
167                    target_os = "nto",
168                    target_os = "hermit",
169                ))]
170                sin6_len: 0,
171                #[cfg(target_os = "vita")]
172                sin6_vport: addr.port().to_be(),
173                #[cfg(any(target_os = "illumos", target_os = "solaris"))]
174                __sin6_src_id: 0,
175            };
176
177            let sockaddr = SocketAddrCRepr { v6: sockaddr_in6 };
178            let socklen = size_of::<libc::sockaddr_in6>() as libc::socklen_t;
179            (sockaddr, socklen)
180        }
181    }
182}
183
184/// Converts a `libc::sockaddr` compatible struct into a native Rust `SocketAddr`.
185///
186/// # Safety
187///
188/// `storage` must have the `ss_family` field correctly initialized.
189/// `storage` must be initialised to a `sockaddr_in` or `sockaddr_in6`.
190pub(crate) unsafe fn to_socket_addr(
191    storage: *const libc::sockaddr_storage,
192) -> io::Result<SocketAddr> {
193    match (*storage).ss_family as libc::c_int {
194        libc::AF_INET => {
195            // Safety: if the ss_family field is AF_INET then storage must be a sockaddr_in.
196            let addr: &libc::sockaddr_in = &*(storage as *const libc::sockaddr_in);
197            let ip = Ipv4Addr::from(addr.sin_addr.s_addr.to_ne_bytes());
198            let port = u16::from_be(addr.sin_port);
199            Ok(SocketAddr::V4(SocketAddrV4::new(ip, port)))
200        }
201        libc::AF_INET6 => {
202            // Safety: if the ss_family field is AF_INET6 then storage must be a sockaddr_in6.
203            let addr: &libc::sockaddr_in6 = &*(storage as *const libc::sockaddr_in6);
204            let ip = Ipv6Addr::from(addr.sin6_addr.s6_addr);
205            let port = u16::from_be(addr.sin6_port);
206            Ok(SocketAddr::V6(SocketAddrV6::new(
207                ip,
208                port,
209                addr.sin6_flowinfo,
210                addr.sin6_scope_id,
211            )))
212        }
213        _ => Err(io::ErrorKind::InvalidInput.into()),
214    }
215}
mio/sys/unix/net.rs

mio/sys/unix/
net.rs
